body{ color: black; background-color: white; 
/*
      border-style: solid; padding:1em;
      border-color : silver; border-width : 10px;
*/
    }
h1{ color: white; background-color: green; text-align: center}
h2{ color: green; background-color: aqua; text-align: center}
h3{ color: black; background-color: aqua; text-align: left}
div{ text-align: left; }
img,span{ text-align: center;}
p { color : black }
div.command {font-weight: bold; color : black}
code { color : green}
em { color : blue }
.command { font-weight: bold; color : blue}
/*
table { background-color : #ccccff }
*/